LazyDelegateProvider.java
/*
* Copyright 2021 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.keycloak.models.map.common.delegate;
import org.keycloak.models.map.common.AbstractEntity;
import org.keycloak.models.map.common.EntityField;
import org.keycloak.models.map.common.UpdatableEntity;
import java.util.concurrent.atomic.AtomicMarkableReference;
import java.util.function.Supplier;
/**
*
* @author hmlnarik
*/
public class LazyDelegateProvider<T extends AbstractEntity> implements DelegateProvider<T> {
protected final LazilyInitialized<T> delegateSupplier;
public LazyDelegateProvider(Supplier<T> delegateSupplier) {
this.delegateSupplier = new LazilyInitialized<>(delegateSupplier);
}
@Override
public T getDelegate(boolean isRead, Enum<? extends EntityField<T>> field, Object... parameters) {
T ref = delegateSupplier.get();
if (ref == null) {
throw new IllegalStateException("Invalid delegate obtained");
}
return ref;
}
@Override
public boolean isUpdated() {
if (delegateSupplier.isInitialized()) {
T d = delegateSupplier.get();
return d instanceof UpdatableEntity ? ((UpdatableEntity) d).isUpdated() : false;
}
return false;
}
}